Set CVV as a Required Field with PMPro

my_require_cvv_for_reals.php

/**
 * Set CVV as a Required Field with PMPro
 * Add this code to a custom plugin. https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 *
 * NOTE: Doesn't yet work with all gateways.
 * You'll need to make sure the gateway is set to require CVV/CVC
 * and then add an elseif ( ... ) below to set the $CVV var
 * if you see a valid gateway token/etc.
 */
function my_require_cvv_for_reals( $fields ) {	
	if ( ! empty( $_REQUEST['CVV'] ) ) {
		$CVV = sanitize_text_field( $_REQUEST['CVV'] );	
	} elseif ( ! empty( $_REQUEST['stripeToken0'] ) ) {
		// Stripe. Make sure you set the Radar rule to require CVC check.
		$CVV = true;
	} else {
		$CVV = '';
	}
	
	$fields['CVV'] = $CVV;
	
	return $fields;
}
add_filter( 'pmpro_required_billing_fields', 'my_require_cvv_for_reals', 15 );